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Method for preparing Fenton photocatalyst through sludge pyrolysis as well as catalyst and application

A catalyst and photocatalytic technology, applied in chemical instruments and methods, water/sludge/sewage treatment, water pollutants, etc., can solve problems such as retention and lack of large-scale reactor design, and achieve low cost and easy control of the reaction process , high catalytic performance

Inactive Publication Date: 2018-09-07
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] At present, photocatalytic reactors only stay in the small-scale water treatment process and experimental stage, lacking the design of large-scale reactors, and it is difficult to meet the needs of today's highly developed industrialization

Method used

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  • Method for preparing Fenton photocatalyst through sludge pyrolysis as well as catalyst and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] ① After drying the sludge from the urban domestic sewage treatment plant, use N 2 Calcined at 600° C. for 4 hours as a protective gas, and then cooled to room temperature to obtain sludge charcoal.

[0026] ② Soak the sludge charcoal obtained above with 10% sulfuric acid at 20°C for 2 hours, then rinse the soaked sludge charcoal with tap water until the pH value of the effluent is 6, and treat the treated sludge charcoal at 120 ℃, to obtain surface-modified sludge charcoal.

[0027] ③Impregnate Fe(NO 3 ) 3 9H 2 O solution, use N 2 As protective gas, bake at 500°C for 2h, under N 2 Cooled to room temperature under the protection of the metal / sludge activated carbon catalyst, the active component loading was 5.0wt.% in terms of metal.

[0028] ④ Photo-Fenton reaction experimental conditions: metal / sludge carbon catalyst dosage is 0.5g / L, initial concentration of o-chlorophenol is 1000mg / L, Na 2 SO 4 The content is 5g / L, H 2 o 2 (mg / L): COD (mg / L)=1, the light in...

Embodiment 2

[0030] ① After drying the sludge from the urban domestic sewage treatment plant, use N 2 Calcination was performed at 700°C for 5 hours as a protective gas, and then cooled to room temperature to obtain sludge charcoal.

[0031] ② Soak the sludge charcoal obtained above with 20% sulfuric acid at 20°C for 4 hours, then rinse the soaked sludge charcoal with tap water until the pH value of the effluent is 7, and treat the treated sludge charcoal at 80 ℃, to obtain surface-modified sludge charcoal.

[0032] ③Impregnate the surface-modified sludge carbon with equal volume of AgNO 3 solution, use N 2 As protective gas, bake at 400°C for 5h, under N 2 Cooled to room temperature under the protection of the metal / sludge activated carbon catalyst, the active component load was 1.0wt.% in terms of metal.

[0033] ④ Photo-Fenton reaction experimental conditions: metal / sludge carbon catalyst dosage is 0.5g / L, initial concentration of o-chlorophenol is 2000mg / L, Na 2 SO 4 The content ...

Embodiment 3

[0035] ① After drying the sludge from the urban domestic sewage treatment plant, use N 2 Calcination was performed at 800°C for 6 hours as a protective gas, and then cooled to room temperature to obtain sludge charcoal.

[0036] ② Soak the sludge charcoal obtained above with 30% sulfuric acid at 40°C for 3 hours, wash the soaked sludge charcoal with tap water until the pH value of the effluent is 6, and treat the treated sludge charcoal at 85 ℃, to obtain surface-modified sludge charcoal.

[0037] ③Impregnate the surface-modified sludge carbon with equal volume of AgNO 3 and Mn(NO 3 ) 2 4H 2 O solution, use N 2 As a protective gas, bake at 700 ° C for 4 h, in N 2 Under the protection of cooling to room temperature, the metal / sludge activated carbon catalyst is obtained, in terms of metal Ag 2 O loading is 1 wt.%, as metal MnO 2 The loading was 4.0 wt.%.

[0038] ④ Photo-Fenton reaction experimental conditions: metal / sludge carbon catalyst dosage is 0.3g / L, initial con...

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Abstract

The invention provides a method for preparing a novel and efficient Fenton photocatalyst through sludge pyrolysis and application of the Fenton photocatalyst. The method provided by the invention comprises the following steps: taking active sludge of a municipal sewage treatment plant as a raw material and carrying out pyrolysis at high temperature to prepare sludge activated carbon; treating by utilizing H2SO4 to obtain surface-modified sludge carbon; taking one or more than two of Fe2O3, MnO2, Ag2O, In2O3, Bi2O3 and SrO as active components and loading on a sludge activated carbon carrier; carrying out impregnation, mixing and pyrolysis to obtain the novel and efficient Fenton photocatalyst. The novel and efficient Fenton photocatalyst prepared by the method has the advantages of high activity, small impregnation amount of the active components, simplicity in preparation, mature technology, good stability, low cost and the like. According to the method provided by the invention, theremoval rate of TOC (Total Organic Carbon) in organic wastewater reaches 95 percent or more. The Fenton photocatalyst prepared by the method has high catalytic performance and a stable structure, andthe catalyst prepared by sludge pyrolysis is easily popularized in a photocatalytic oxidation industry.

Description

technical field [0001] The invention relates to a novel high-efficiency sludge pyrolysis method for preparing a photo-Fenton catalyst and its application, which is suitable for photocatalytic oxidation treatment of refractory industrial organic wastewater and belongs to the field of water treatment technology and environmental functional materials. technical background [0002] The rapid development of social economy has promoted the continuous improvement of the level of industrialization and urbanization, and the corresponding petrochemical, plastic, synthetic fiber, coke and other industries have developed rapidly, and the discharge of various organic wastewater has increased year by year. Organic wastewater has potential toxicity of carcinogenicity, teratogenicity and mutagenesis, affects the growth and reproduction of aquatic organisms, pollutes drinking water sources, has seriously threatened human survival, safety and healthy development, and constituted an important c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F1/32C02F101/34C02F101/36
CPCC02F1/32C02F1/725C02F2305/026C02F2305/10C02F2101/36C02F2101/345
Inventor 于杨何益得黄菲张永军胡炼
Owner NANJING UNIV OF TECH
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